The best option i would have to go with very first i mean top on the list would be going to the top of the page and putting in "straight 6 upgrades" or " 300 upgrades" or how ever you want to in the box next to search ,then click on search, and BAM!! A wonderful world full of answers...just sayin...

Maintain it - nothing else. Mine has about half a million miles on it (really), and I'm putting it into its 3rd chassis so I can keep flogging it. The first was wrecked so hard the engine ripped off the mounts & broke every accessory off the block; the 2nd got rolled, then driven for over a decade at ludicrous speeds on- & off-road. This time, I'm not gonna go easy on it.

Bronco Info: 92 Factory Original 300 I6 M5OD Manual Custom. 3 seats, AC and a radio and all vinyl interior.

For the EFI 4.9L 300's, there's really not a whole lot you can add to it that it doesn't already have. Crane and 1 other company(can't recall now) makes a computer compatible cam for it. Other than that, you're pretty much done. You can put in a 2.5" exhaust which is a minor upgrade from the 2.25 that's in it already. I did the 6Litre tune up and noticed nothing different. I replaced the rusted out factory exhaust with a full header back 2.5" unit and noticed no difference either. Mine is a '92 EFI engine that was very well maintained by the previous owner so if there was going to be any changes from what I've read that would gained me anything, so far they haven't worked.

Over on Ford six, you can find people who put in $1000's of dollars in order to get serious HP/Tq. It's only worth it if you truly love the 300's like some of us do. You could easily spend much less on a V8 to get more power.

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JTMcD.We sleep Peaceful in our beds because Rough Men stand ready in the night to visit violence upon those who would do us harm............George OrwellThe object of life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting, 'Holy Shit, What a Ride!!! -- Mavis Leyrer

Over on Ford six, you can find people who put in $1000's of dollars in order to get serious HP/Tq. It's only worth it if you truly love the 300's like some of us do. You could easily spend much less on a V8 to get more power.

i love my 300, but for that amount of cash, why not go from a inline six gas to a diesel 5.9?

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A general rule in modding a vehicle is: Powerful, Reliable, Cheap; You can only pick two, not three.

The 300 is a great engine in stock form, but there ARE performance parts for it.

However, 90% of them are for the carb'd engine. The fuel injected computer doesn't take too well to mods.

The 300's biggest issue is its inability to breath. The carb'd model especially. The carb, intake, head, and exhaust manifold was simply too restrictive for the amount of cubic inches the engine it.

For my 300, I have exhaust manifolds from a fuel injected 4.9, which is a great upgrade and flow way better than stock. There are also headers available, but they're significantly more expensive, and come with problems of their own. For a mildly built 300, the EFI manifolds are where it's at. Pair that with a 2.5" exhaust out the back. I have a turbo muffler on mine and really like it.

The 1bbl carb is also much too small. It's only about 190cfm, which doesn't let the engine rev much above 3000 RPMs. Clifford performance and offenhauser both make 4bbl intakes for the 300 that'll let you put on a nearly infinite range of carbs. A well tuned 4bbl should be able to get you way more power, plus nearly the same gas mileage as the stock 1bbl. Mine has WAAAY more power than stock, and I get 17 - 19 on the interstate and around 14 around town.

Just an intake/carb and exhaust is going to really wake that motor right up. But, if you want to take it further, port and polish the head to really let it breath. Then, you can pick a cam of your choice (a 260h is a common choice). Installing larger valves into the head will do a lot for it as well.

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